It's definitely unusual. Most guys have what's called a refractory period, in which their body becomes incapable of orgasming for a brief period. For most, the refractory period is about 15 minutes roughly, but it tends to get longer as we age. Evidently, however, your physiology is different. Congratulations! It probably won't last forever, so enjoy it while you can do it.

"We hurt the ones we love the most. It's a subtle form of compliment."

are you on any kind of medication some diuretics tend to cause premature ejaculation while its common that ssri antidepressants tend to cause delayed ejaculation anyway if it works for you then enjoy it